Anthraquinone coloring-matters and process of making them.



UNITED STATES PATENT OFFICE.

MAX-HENRY ISLER, -OF MANNHEIM, GERMANY, ASSIGNOR TO BADISCHE ANILIN & SODA FABRIK, OF LUDWIGSHAFEN-ON-THE-RHINE, GERMANY, CORPORATION.

ANTHRA QUINONE COLORING-MATTERS AND PROCESS OF MAKING THEM.

Ho Drawing.

To all whom it may concern:

Be it known that I, MAX HENRY Isnnn, citizen of-th Swiss Republic, residing at Mannheim, Germany, 'have invented new and useful Improvements in Anthraquinone Coloring-Matters and Processes of Making Therm-of which the following is a specification.

I. have found that new coloring matters of the anthracene series can be obtained by condensing either an aldehyde of the an thraquinone series, or an omega-dihalogenmethyl-anthraquinone, with -urea or with thio-urea, the reaction being preferably effected by heating the components together at a temperature of, say, from 120 to 150 (1, in the presence of a suitable solvent (such for instance as quinolin, or pyridin) until the formation of the coloring matter is complete.

My new colorin matters are characterized by being insoTuble in dilute. acids and alkalis, very diflicultly soluble in toluene and in glacial acetic acid, soluble in nitrobenzene and also soluble in concentrated sulfuric acid yielding from yellowish brown to red solutions. 'With alkaline hydrosulfite they yield brown to yellow vats and dye cotton from yellow to red shades.

In this application I include both urea and thiourea under the formula in which Xincludes a divalent metalloid, in particularoxygen and sulfur.

The following are examples of how my invention can be carried into practical effect, but theinvention is not confined to these examples. The parts are by weight.

Example 1: Boil together, for from 2 to 3 hours, in a reflux apparatus, 30 parts of anthraquinone-Q-aldehyde, 12 parts of urea, and 90 parts of pyridin. The coloring matter", which separates out in the heat, is then filtered off, washed with pyridin'and dried. After recrystallization from nitrobenzene it yields a yellow-red. solution in concentrated sulfuric acid. lVith alkaline hydrosulfite it yields a brown-yellow vat which colors cotton brown-yellow shades which, upon exposure to the air and subsequent boiling with soap solution, become pure yellow.

Example): Boil together, for a few Specification of Letters Patent.

Patented Mar. 3, 1914.

Application filed December 16, 1911 Serial No. 666,114.

hours, in a reflux apparatus, 30 parts of anthraquinone-2-aldehyde, 12 parts of thiourea, and parts of pyridin, and then work up the product in the mariner described in the foregoing example. The coloring matter can here-crystallized from nitrobenzene and then yields a reddish yellow solution in concentrated sulfuric. acid. It forms a yellow-brown vat which colors cotton similar shades, which shades on washing and soaping become dark brick red.

Example 3: Boil together, for a few'hours, in a reflux apparatus, 25 parts of omegadichlor-Q-methyl-anthraquinone,1O parts of thio-urea, 50 parts of pyridin and 15 parts of anhydrous sodium acetate, and then work up the product as described in the foregoing example 1. The coloring matter can b obtained in the pure condition by extracting the crude product with glacial acetic acid and then recrystallizing from nitrobenzene. The said coloring matter yields a yellowbrown'colored solution in. concentrated sulfuric acid, and with alkaline hydrosulfite it yields a yellow-brown vat which dyes cotton yellowish red shades.

In a similar manner, colorin matters can be obtained from other aldehy es, or omegadihalogen-methyl derivatives of anthraquinone. For the purposes of this invention an omega-dihalogen-methy1-anthraquinone is equivalent to the corresponding anthraquinone-aldehyde.

Now what I claim is:

1. The process of producing coloring matter of the authraquinone series by condensing an aldehyde of the anthraquinone series with a compound corresponding to the formula cz xNFx NH, in which X includes a. divalent metalloid.

2. The process of-producing coloring matter of the anthraquinone series by condensing anthraquinone-Q-aldehyde with urea.

3. The new coloring matters which can be obtained by condensing an aldehyde of the anthraquinone series with a compound corresponding to the formula in which X includes a divalent metalloid, which coloring matters are characterized by being insoluble in dilute acids and alkalis, very difiicultly soluble in toluene and in glacial acetic acid, soluble in nitrohenzene and also soluble in concentrated sulfuric acid yielding from yellowish brown to red solutions, and which with alkaline hydrosulfite yield brown to yellow vats'dyeing cotton from yellow to red shades.

4. The new coloring matter of the anthraquinine series which can condenslng anthraquinone-Q-aldehyde with soluble in toluene and in glacial acetic acid,

centrated sulfuric acid, and which with al-- knline hydrosulfite yields a brown-yellow vat which dyes cotton pure yellow shades.

In testimony whereof I have hereunto set 1 my hand in the presence of two subscribing be obtained by urea, which coloring matter is insoluble in i dilute acids and alkalis,

is very difiicultly witnesses. I

, MAX HENRY ISLER. Witnesses:

J. ALEo. LLOYD, A. O. T ILLMANLY. 

